Kanban is an approach used in manufacturing in which stock to be consumed is only moved to the production line when it is needed. The result is, therefore, a demand-led, pull system. For a simple example, see http://en.wikipedia.org/wiki/Kanban_board

The alternative, and in the West, traditional approach to manufacturing involves moving stock to the line to be processed i.e. it is a push system.

Most of us manage our tasks and to-do lists with a push approach. Basically, we pile it all in.

And the result is stress and reduced achievement.

Moving from a push approach to a pull approach to managing tasks makes a world of a difference.

The two key principles of Personal Kanban are: Visualize your work and limit your work in progress.